Campaign Monitor REST API Client for PHP

A simple PHP http client for the Campaign Monitor REST API. Optimized for JSON and authentication via API key. Based on Guzzle.

CampaignMonitorRestClient is an extended GuzzleHttp\Client, so it can do all the things that Guzzle can and a bit more.

Be sure to refer to the Campaign Monitor API documentation for details.

Installation

Via composer:

composer require ilrwebservices/campaign-monitor-rest-api-client

Usage

<?php

require __DIR__ . '/../vendor/autoload.php';

use CampaignMonitor\CampaignMonitorRestClient;

$client = new CampaignMonitorRestClient([
  'api_key' => $_ENV['CAMPAIGN_MONITOR_API_KEY'],
]);

Note how the API key is passed into the client constructor options along with other Guzzle-compatible options. In this example, the API key is stored in an environment variable since it is sensitive information that should not be stored in code.

The CampaignMonitorRestClient will set the base_uri option to https://api.createsend.com/api/v3.2/ automatically. To use a different base uri (for example for a different API version), you can specify it explicitly:

$client = new CampaignMonitorRestClient([
  'api_key' => $_ENV['CAMPAIGN_MONITOR_API_KEY'],
  'base_uri' => 'https://api.createsend.com/api/v3.1/',
]);

You can now make API calls just as you would in Guzzle:

$client_response = $client->request('GET', 'https://api.createsend.com/api/v3.2/clients.json');

Since the base_uri option is pre-configured, you can use a relative URL (be sure not to add a leading /, though):

$client_response = $client->request('GET', 'clients.json');

And because it's Guzzle, there are shorthand methods:

$client_response = $client->get('clients.json');

Responses are PSR-7 response messages, just like Guzzle, so you can get returned data via getBody():

$client_data_raw = (string) $client_response->getBody();

// Returns:
// [{"ClientID":"86753099713df60ae6545c9b338e3210","Name":"BungeeMan Enterprises"}]

For application/json responses, CampaignMonitorRestClient adds a non-standard getData() method that decodes the JSON response for you:

$client_data = $client_response->getData();

// Returns:
// Array
// (
//     [0] => Array
//         (
//             [ClientID] => 86753099713df60ae6545c9b338e3210
//             [Name] => BungeeMan Enterprises
//         )
// )

Be careful with large responses, however, as they can consume too much memory.

Sending JSON data to API endpoints can be done using the json request option from Guzzle:

$new_client_response = $client->post('clients.json', [
  'json' => [
    'CompanyName': 'Cyberdyne Systems',
    'Country': "Australia",
    'TimeZone': "(GMT+10:00) Canberra, Melbourne, Sydney"
  ],
]);

Error handling

You can use Guzzle exceptions for error handling. Campaign Montior endpoints generally use 4xx codes for errors, so GuzzleHttp\Exception\ClientException is a good match for catching those errors.

try {
  $new_client_response = $client->post('clients.json', [
    'json' => [
      'CompanyName' => 'Cyberdyne Systems',
      'Country' => 'Australia',
      'TimeZone' => '(GMT+10:00) Canberra, Melbourne, Sydney',
    ],
  ]);
}
// Could not connect to server or other network issue.
catch (\GuzzleHttp\Exception\ConnectException $e) {
  print_r($e->getMessage());
}
// 4xx error. This is the bulk of Campaign Monitor API errors, and details about
// the error can be found in the error message and response data.
catch (\GuzzleHttp\Exception\ClientException $e) {
  print_r($e->getResponse()->getData());
  print_r($e->getMessage());
}
// 5xx error. This is an 'unhandled API error' in Campaign Monitor.
catch (\GuzzleHttp\Exception\ServerException $e) {
  print_r($e->getResponse()->getData());
  print_r($e->getMessage());
}

If the above request to create a new client failed, a GuzzleHttp\Exception\ClientException would be thrown and the following output displayed:

Array
(
    [Code] => 51
    [Message] => Not allowed for a Non-agency Customer.
)
Client error: `POST https://api.createsend.com/api/v3.2/clients.json` resulted in a `403 Forbidden` response:
{"Code":51,"Message":"Not allowed for a Non-agency Customer."}

Inspired by drewm/mailchimp-api.